UC2845BD1013TR from STMicroelectronics, in a SO-8. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	COMP	output	Error amplifier output made available for loop compensation. Typical output high ~6.2V, output low ~0.8V; sources up to 0.5mA and sinks up to 2mA (min).
2	VFB	input	Inverting input of the error amplifier. Normally connected to the switching power-supply output through a resistor divider; internal reference is 2.5V. Input bias current typ -0.1uA.
3	ISENSE	input	Current-sense input. A voltage proportional to inductor/switch current is applied here; the PWM uses this signal to terminate output-switch conduction. Maximum input threshold ~1.0V (Ipk = 1.0V/Rs).
4	RT/CT	passive	Oscillator timing pin. Connect RT from this pin to VREF and CT from this pin to GND to program oscillator frequency and maximum duty cycle. Operation up to 500kHz.
5	GROUND	power_in	Combined control-circuitry and power ground return. All voltages are referenced to this pin.
6	OUTPUT	output	High-current totem-pole gate-driver output for an external power MOSFET. Sources and sinks peak currents up to 1A. Output is held low during UVLO.
7	VCC	power_in	Positive supply for the control IC (labeled Vi in the block diagram). UC2845B UVLO turn-on ~8.4V, turn-off ~7.6V. Absolute maximum 30V (self-limiting via internal 36V zener). Operating supply current typ 12mA; start-up current <0.5mA.
8	VREF	power_out	Trimmed 5.0V reference output (5.00V typ, ±1% at 25°C, 50mA rated). Provides charging current for CT through RT and can supply external loads.

Key specifications

Parameter	Value
Manufacturer	STMicroelectronics
Package	SO-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

UC2845BD1013TR
UC2845BN

CAD (KiCad official)

Symbol: UC2845BD1013TR
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SO-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`uc2845bd1013tr.step`	122 KB	You want the bare part, or you mark your own boards.
`uc2845bd1013tr-etched.step`	3.0 MB	You want the part with `UC2845BD1013TR` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 732 faces against 147 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: STMicroelectronics datasheet (15 pp, sha256 fedfd7362400f8b3, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF